The 3W 55i engine is supplied together with UAV Factory’s proprietary 80W onboard generator system. The generator system is factory installed on the 3W 55i engine and tested before delivery. The two-stroke 3W 55i engine is a proven choice for unmanned aircraft vehicles due to excellent power-to-weight ratio and reliability. The 55i engine is available in both pusher and tractor versions.
Generator system description:
Onboard Generator system consists of a Generator Power Unit (GPU), belt driven industrial-grade coreless generator, mounts and wiring. System is capable of providing up to 80W maximum continuous power to onboard electronics. GPU is designed to provide onboard dual voltage regulated power supply of 6 and 12 Volts. Despite small size, GPU offers outstanding efficiency as well as unique features such as the ability to monitor load, battery current, engine rpm, generated and battery voltage. All power distribution parameters are sent through serial TTL communication and can be transmitted to the UAV ground control station. Integrated Lithium Polymer charger is used for the backup battery, which is switched on during the pre-flight checks or low engine speed. GPU is packed in a sealed aluminum enclosure and fitted with the high-end industrial push-pull connectors. Wire harness is included in the package.
The following items are included in the 3w 55i engine and generator system:
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3W 55i engine. Pusher or tractor engine versions are available
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Ignition unit
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Preinstalled 80W onboard generator system
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Generator Power Unit
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Wiring with Fischer push-pull connectors installed
Product Specification
Engine Specifications:
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PARAMETER
|
VALUE
|
|
Engine model
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3W 55i, two stroke
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|
Power
|
5.2 hp
|
|
Capacity
|
55 cc
|
|
Speed range
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1300-8500 rpm
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|
Oil / Gasoline Ratio
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1:50 / 2% mix
|
|
Recommended 2-bladed Propellers
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22x8, 22x10, 22x12, 24x8
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|
Recommended 3-bladed Propellers
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22x10, 22x12
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|
Engine weight ( including ignition)
|
1.9 kg
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|
Muffler
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Not included
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Electrical Specifications:
|
PARAMETER
|
VALUE
|
|
Generator type
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Brushed
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|
Generator voltage range
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13 – 50 VDC
|
|
External power supply voltage range
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13 – 50 VDC
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|
Battery Type
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3 cells Li-Polymer (not included)
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|
Battery Voltage
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12.6 V
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|
Maximum battery charging current
|
2 A
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|
Maximum continuous generator current
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3.5 A
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Maximum continuous battery current
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8 A
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Maximum continuous external power current
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8 A
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Output voltage
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6 V and 12 V
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|
Maximum output voltage ripple
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50 mV @6V 50 mV@12V
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Continuous load current, 6 Volt output 1,2
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5 A
|
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Continuous load current, 12 Volt output 1,2
|
5 A
|
|
Maximum GPU efficiency
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90 %
|
|
Maximum total generator system efficiency
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75 %
|
|
Maximum peak load current
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10 A for 10 seconds
|
|
No load GPU current
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110 mA
|
|
Tachometer range
|
1000-9000 rpm
|
|
Tachometer accuracy
|
200 rpm
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|
Current sensor range
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0 to 10 A
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|
Current sensor accuracy
|
0.2 A
|
|
Voltage sensor accuracy
|
0.1 V
|
|
Serial Communication
|
5V TTL
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Generator System Mechanical Specifications:
|
PARAMETER
|
VALUE
|
|
GPU Dimensions
|
59.4 x 115.8 x 32.4 mm
|
|
GPU Weight
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~190 grams
|
|
Complete Onboard Generator System weight
|
~500 grams
|
|
Maximum GPU enclosure temperature
|
70°C
|
|
Environmental protection
|
IP 64 standard, IP 68 on request
|
|
Operating temperature
|
- 40°C to +50°C 2
|
|
Electrical connectors
|
Fischer 104 Series push-pull connector
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1 Generator continuous current must not exceed 3.5 A
2 Enclosure temperature must not exceed 70 °C , additional cooling may be required
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